fix: __changedProperties not working with multiple instances

__changedProperties is now part of instance

Signed-off-by: Wouter Vroege <[email protected]>

src/addons/properties-changed-callback-mixin.js

@@ -2,25 +2,25 @@ export const PropertiesChangedCallback = (SuperClass) => class extends SuperClas
 
   propertyChangedCallback(propName, oldValue, newValue) {
     super.propertyChangedCallback && super.propertyChangedCallback(propName, oldValue, newValue);
-    if(!this.constructor.__changedProperties) this.constructor.__changedProperties = new Map();
+    if(!this.__changedProperties) this.__changedProperties = new Map();
     this.constructor.__addChangedProperty.call(this, propName, oldValue);
   }
 
   static __addChangedProperty(propName, oldValue) {
     window.cancelAnimationFrame(this.__propertiesChangedCallbackDebouncer);
-    const changedProps = this.constructor.__changedProperties;
+    const changedProps = this.__changedProperties;
     if(!changedProps.has(propName)) changedProps.set(propName, oldValue);
     this.__propertiesChangedCallbackDebouncer = window.requestAnimationFrame(this.constructor.__invokeCallback.bind(this));
   }
 
   static __invokeCallback() {
     const oldValues = {};
     const newValues = {};
-    this.constructor.__changedProperties.forEach((oldValue, propName) => oldValues[propName] = oldValue);
-    this.constructor.__changedProperties.forEach((oldValue, propName) => newValues[propName] = this[propName]);
+    this.__changedProperties.forEach((oldValue, propName) => oldValues[propName] = oldValue);
+    this.__changedProperties.forEach((oldValue, propName) => newValues[propName] = this[propName]);
     const propNames = Object.keys(oldValues);
 
-    this.constructor.__changedProperties.clear();
+    this.__changedProperties.clear();
     this.propertiesChangedCallback && this.propertiesChangedCallback(propNames, oldValues, newValues);
   }